Add the talk to the landing showcase; point Atlas at its subdomain

- Landing 'From hackerspace.sh' showcase: add a 'Hacking Your Hackerspace'
  tile (07 projects) linking the deck on hack.build, with a new HackBuildIcon
  (the brand's pink open-end wrench).
- Point the Atlas tile at https://atlas.hackerspace.sh (now live) instead of
  the old internal /atlas route.
- Use the same hack.build wrench for the talk card on the Resources page.

app/(resources)/resources/page.tsx

@@ -8,7 +8,7 @@ import {
   CubeIcon,
   KeyIcon,
   GridIcon,
-  PlayIcon,
+  HackBuildIcon,
 } from '@/components/resources/icons'
 import { AtlasLogo } from '@/components/resources/atlas-logo'
 
@@ -124,7 +124,7 @@ export default function ResourcesLandingPage() {
                 title="Hacking Your Hackerspace"
                 description="A talk on the patterns, pitfalls, and governance lessons behind keeping a hackerspace alive — the research from these projects, condensed into one interactive session."
                 type="Talk · Interactive"
-                visual={<PlayIcon />}
+                visual={<HackBuildIcon />}
               />
             </div>
           </section>